Junction Hollow redesign

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paulheckbert
Moderator
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There was another meeting related to Junction Hollow / Panther Hollow / Four Mile Run stormwater yesterday. This affects the Junction Hollow Trail.

Pittsburgh Water & Sewer Authority (PWSA) and Pittsburgh Parks Conservancy want to restore more natural stream flow in Four Mile Run and its tributaries, Junction Hollow Run, Panther Hollow Run, and Phipps Run. At the meeting, they presented their preliminary design for the stormwater handling in these watersheds. My synopsis:

  • Daylight (bring out of the culvert) Junction Hollow Run for all of its length, and Four Mile Run until it gets close to Greenfield Ave.
  • Do major landscaping around Panther Hollow Lake to deepen it, in Junction Hollow create flood plains to buffer water during flood events. The soccer field would be one. Hillsides full of japanese knotweed would get replanted.
  • Panther Hollow Lake would drain through a tunnel under the CSX railroad tracks that would accommodate both trail and water flow. Yay! Expect occasional trail flooding here.
  • Create a meandering bike/ped path through Junction Hollow that crosses Junction Hollow Run several times. The levees and bridges on which this trail runs would act as partial dams to slow water flow.
  • Expect less flooding in the Four Mile Run neighborhood.
  • Create an additional bike/ped path on the west hillside of Junction Hollow that doesn’t meander. This would be the fast bike route.
  • They mostly avoided discussing it (“that’s DOMI”) but this hillside trail might also support the shuttle between Hazelwood Green and Oakland. If the shuttle happens, the trail would be a protected bike lane on the road. They plan to keep a trail open during construction.
  • No plans related to The Chute. That’s DOMI, not PWSA.
  • Major construction late 2019 – late 2020. There’s other planned construction on residential streets upstream of these runs (redirection of home downspouts out of the combined sewer pipes into bioswales) that might be completed 10-20 years from now.

Maps from the meeting, scroll down at: http://4mr.org/get-involved/public-meetings/


Ornoth
Member
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Generally looks like an improvement to me, so long as the Hillside Path is asphalt rather than crushed stone.

Does this imply any improvement of Zigzag & Bridle Trails? Those could be a timesaver for travel between the EFT trailhead and Squirrel Hill South. Tho alternately the route past PH Lake could also suffice, if paved.


paulheckbert
Moderator
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Here are two of the posters from Wednesday’s meeting. See that 4mr.org link for the others.

table4_30

table5_30


paulheckbert
Moderator
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Attendees were requesting improvements to the Zigzag trail (e.g. easier grade). One of their posters said something about improved drainage on Bridle trail. They didn’t discuss trail surfaces in any detail.


andreaboykowycz
Participant
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Zigzag trail or something like it would really be needed in advance of PWSA’s breaking ground, to ensure there’s a detour in place for the Junction Hollow trail, which will be completely unusable for at least a year after construction begins. In any case, it would be a great amenity to have a traffic-free bike-friendly route connecting the bottom of the hollow to the top of Oakland/Squirrel Hill/Greenfield. Advocates needed to make sure DOMI doesn’t omit to provide this detour.


Eric
Member
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trib article about the official unveiling of the plan. not really any new info.

 

https://triblive.com/local/allegheny/14347199-74/pittsburghs-four-mile-run-slated-for-millions-in-improvements


NMR
Member
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The Pittsburgh Water and Sewer Authority has committed $40 million to the project as part of its federally required stormwater management plan, according to spokesman Will Pickering. Peduto has set aside a total of $23 million in 2019 and 2020, according to the city’s 2019 capital budget.

Does anyone know the cost breakdown here? How much is the GI project and how much is the shuttle road?


paulheckbert
Moderator
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I don’t know in detail but I bet that the budgeted money doesn’t include shuttle, since the shuttle design is still up in the air.


Eric
Member
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Does Hazelwood Green have any future tenants yet?  Is anything being built there currently or is it all in the planning stages?

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